Go here...

http://microengineeringlabs.com/products/pbc.htm

click on the big 'CompileSpot' Button

This is good for simple programs only as it is limited and is intended as a "try before you buy". I can't tell you if that program on the Rentron site is too big or not - you may need to make some changes.

If you intend to play (or be serious) with PICs, or want to move away from 'toytown' Basic Stamp into a 'grown-up' world, then buying one of MeLabs compiler products (especially PIC Basic Professional) is recommended.

Melanie